The main complications after femtosecond laser surgery are overcorrection or undercorrection, which is a possible deviation from the preoperative target value. This can be caused by inaccurate preoperative refractive examinations, different surgical environments, and surgical practices. There is also refractive regression. If the patient has blurred vision again after the surgery, the optometrist will find that the refraction appears again, which may be related to the postoperative eye use and wound healing. Many people complain of dry eyes after surgery, mainly due to the cut of sensory nerve fibers during surgery, resulting in a decrease in basic tear secretion.